package fip.map.br;

	public class HeatIndexDisplay implements Observer, DisplayElement {
		float heatIndex = 0.0f;
		private WeatherData weatherData;

		public HeatIndexDisplay(WeatherData weatherData) {
			this.weatherData = weatherData;
			weatherData.registrerObserver(this);
		}

		public void update(float t, float rh, float pressure) {
			heatIndex = computeHeatIndex(t, rh);
			display();
		}
		
		private float computeHeatIndex(float t, float rh) {
			float index = (float)((16.923 + (0.185212 * t) + (5.37941 * rh) - (0.100254 * t * rh) 
				+ (0.00941695 * (t * t)) + (0.00728898 * (rh * rh)) 
				+ (0.000345372 * (t * t * rh)) - (0.000814971 * (t * rh * rh)) +
				(0.0000102102 * (t * t * rh * rh)) - (0.000038646 * (t * t * t)) + (0.0000291583 * 
				(rh * rh * rh)) + (0.00000142721 * (t * t * t * rh)) + 
				(0.000000197483 * (t * rh * rh * rh)) - (0.0000000218429 * (t * t * t * rh * rh)) +
				0.000000000843296 * (t * t * rh * rh * rh)) -
				(0.0000000000481975 * (t * t * t * rh * rh * rh)));
			return index;
		}

		public void display() {
			System.out.println("Heat index is " + heatIndex);
		}
	}
